Antonio Conte accepts that his Chelsea side face a huge task in trying to reach the Champions League quarter-finals at the expense of Barcelona.
The two teams drew 1-1 at Stamford Bridge in the first leg of their last-16 tie, leaving the Catalans with home advantage for the return leg on Wednesday evening.
And Conte is well aware of the need for a top-drawer display, having called the Blues' first-leg performance nearly perfect.
He told the club's official website: "We must be very good, but when you play against this type of team, which I think is one of the best in the world, you must be prepared to suffer - in the same way we did in the first leg, where we were almost perfect.
"We have to work as a team and try to be ready to suffer the moments we have to suffer, and in every moment we have to know that we can have a chance to score."
Chelsea are 3/1 with bet365 to reach the quarter-finals at the expense of Barca.